EP4362290A1 - Motor and motor unit - Google Patents

Motor and motor unit Download PDF

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Publication number
EP4362290A1
EP4362290A1 EP22828007.9A EP22828007A EP4362290A1 EP 4362290 A1 EP4362290 A1 EP 4362290A1 EP 22828007 A EP22828007 A EP 22828007A EP 4362290 A1 EP4362290 A1 EP 4362290A1
Authority
EP
European Patent Office
Prior art keywords
oil path
motor cover
motor
oil
stator housing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP22828007.9A
Other languages
German (de)
English (en)
French (fr)
Inventor
Takuro Kamichika
Shinichi Kurosawa
Shogo Tanino
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yamaha Motor Co Ltd
Original Assignee
Yamaha Motor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yamaha Motor Co Ltd filed Critical Yamaha Motor Co Ltd
Publication of EP4362290A1 publication Critical patent/EP4362290A1/en
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/32—Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
    • H02K5/203—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium specially adapted for liquids, e.g. cooling jackets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/045—Lubricant storage reservoirs, e.g. reservoirs in addition to a gear sump for collecting lubricant in the upper part of a gear case
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/0467—Elements of gearings to be lubricated, cooled or heated
    • F16H57/0476—Electric machines and gearing, i.e. joint lubrication or cooling or heating thereof
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/24—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors with channels or ducts for cooling medium between the conductors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
    • H02K7/116—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/26—Structural association of machines with devices for cleaning or drying cooling medium, e.g. with filters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility

Definitions

  • the present invention relates to motors and motor units, and more specifically to a motor and a motor unit used in an electric vehicle.
  • Patent Literature 1 discloses a driving apparatus.
  • the driving apparatus includes a motor having a rotor and a stator placed radially outside the rotor; a housing which houses the motor; and a cooling medium flow path passing inside the housing and allowing a cooling medium.
  • the housing has an inner circumferential surface
  • the stator has an outer circumferential surface
  • the surfaces are radially opposed to each other.
  • the cooling medium flow path includes an injection hole for injection of the cooling medium between the housing's inner circumferential surface and the stator's outer circumferential surface, and a guide flow path located between the housing's inner circumferential surface and the stator's outer circumferential surface.
  • the guide flow path is a groove which is at least in one of the housing's inner circumferential surface and the stator's outer circumferential surface, extending in a circumferential direction.
  • Patent Literature 1 JP-A 2021-52523
  • Patent Literature 1 does not show sufficient consideration to structural simplification between the housing and the stator, or to size reduction of an outer shape of the housing.
  • a primary object of the present invention is to simplify the structure between the stator housing and the stator core thereby providing a motor and a motor unit including a stator housing having a reduced size.
  • a motor comprising a case including a stator housing, a first motor cover provided at an output side end portion of the stator housing, and a second motor cover provided at a non-output side end portion of the stator housing; an outward oil path provided outside the stator housing and providing communication between the first motor cover and the second motor cover; a return oil path provided outside the stator housing at a lower position than the outward oil path and providing communication between the first motor cover and the second motor cover; a rotor provided inside the case and held by the first motor cover and the second motor cover; and a stator core provided inside the case and radially outside the rotor and fixed to the stator housing.
  • both of the outward oil path and the return oil path are provided, not between the stator housing and the stator core, but outside the stator housing, providing communication between the first motor cover and the second motor cover.
  • the stator core is fixed to the stator housing. Therefore, by simplifying the structure between the stator housing and the stator core, it is possible to reduce the size of the stator housing.
  • the stator core is fixed to the stator housing by means of shrink fit.
  • the outer circumferential surface of the stator core and the inner circumferential surface of the stator housing make surface contact in the circumferential direction, making it possible to hold the stator core more firmly by the stator housing.
  • the first motor cover includes a first oil path communicating with the outward oil path for supplying oil to the outward oil path, and a second oil path branched from the first oil path for supplying oil into the case.
  • a first oil path communicating with the outward oil path for supplying oil to the outward oil path
  • a second oil path branched from the first oil path for supplying oil into the case.
  • the second motor cover includes a third oil path communicating with the outward oil path for supplying oil from the outward oil path into the case.
  • a third oil path communicating with the outward oil path for supplying oil from the outward oil path into the case.
  • the stator housing has no ribs from the output side end portion to the non-output side end portion in its outer circumferential surface. In this case, it is possible to reduce the weight, and further reduce the size, of the stator housing.
  • the motor further includes a first externally attached pipe having the outward oil path and held by the first motor cover and the second motor cover, and a second externally attached pipe having the return oil path and held by the first motor cover and the second motor cover.
  • a first externally attached pipe having the outward oil path and held by the first motor cover and the second motor cover
  • a second externally attached pipe having the return oil path and held by the first motor cover and the second motor cover.
  • the outward oil path has a smaller sectional area than the return oil path. In this case, it is possible to discharge oil to the outside smoothly without the oil stagnating inside the return oil path.
  • a motor unit including the above described motor, and a speed reducer provided on a side of the first motor cover in order to slow down rotation of the rotor and having an oil reservoir communicating with the return oil path.
  • output side end portion of the stator housing refers to an axial end portion of the stator housing from which the motor output is taken off.
  • Non-output side end portion of the stator housing refers to an axial end portion of the stator housing from which the motor output is not taken off (an axial end portion on a side away from the output side end portion).
  • the present invention it is possible to reduce the size of the stator housing by simplifying the structure between the stator housing and the stator core.
  • a motor unit 10 according to an embodiment of the present invention is suitably applied to an electric vehicle.
  • the terms front and rear, left and right, and up and down used in the embodiments of the present invention are defined based on a direction in which a rotor 40 (which will be described later) extends as the left-right direction, and a direction from a motor 12 (which will be described later) toward an inverter 16 (which will be described later) as the rearward direction.
  • “Fr” indicates forward
  • Rr indicates rearward
  • R indicates rightward
  • L indicates leftward
  • U indicates upward
  • “Lo” indicates downward.
  • the motor unit 10 is a mechatronic integrated unit including the motor 12, a speed reducer 14, and an inverter 16.
  • the speed reducer 14 is provided on a side (left side in the present embodiment) of the motor 12, while the inverter 16 is provided behind the motor 12 and the speed reducer 14.
  • the motor 12 includes a case 18.
  • the case 18 has a three-tier structure, and includes a stator housing 20, a first motor cover 22 provided at an output side end portion of the stator housing 20, and a second motor cover 24 provided at a non-output side end portion of the stator housing 20.
  • the second motor cover 24 includes a cover main body 26, and a pipe holder 28 attached to the cover main body 26.
  • a branching piece 30 is provided between the cover main body 26 and the pipe holder 28.
  • first externally attached pipe 32 held by the first motor cover 22 and the second motor cover 24.
  • the first externally attached pipe 32 is a separate member from the stator housing 20, provided slightly spaced away from the stator housing 20, and sandwiched by the first motor cover 22 and the second motor cover 24.
  • the first externally attached pipe 32 has an outlet side end portion, which is held by the pipe holder 28 and is connected with the branching piece 30.
  • Inside the first externally attached pipe 32 there is formed an outward oil path 34 which provides communication between the first motor cover 22 and the second motor cover 24.
  • a second externally attached pipe 36 held by the first motor cover 22 and the second motor cover 24.
  • the second externally attached pipe 36 is a separate member from the stator housing 20, provided slightly spaced away from the stator housing 20, and sandwiched by the first motor cover 22 and the second motor cover 24.
  • the second externally attached pipe 36 has an inlet side end portion, which is held by the pipe holder 28.
  • Inside the second externally attached pipe 36 there is formed a return oil path 38 which provides communication between the first motor cover 22 and the second motor cover 24.
  • the return oil path 38 is provided at a lower position than the outward oil path 34.
  • the outward oil path 34 and the return oil path 38 are columnar shaped.
  • the outward oil path 34 has a smaller sectional area than the return oil path 38.
  • an inner diameter of the first externally attached pipe 32 is smaller than an inner diameter of the second externally attached pipe 36.
  • the rotor 40 is provided inside the case 18.
  • the rotor 40 is held rotatably by the first motor cover 22 and the second motor cover 24 via motor bearings 42, 44.
  • the rotor 40 includes a rotor shaft 46 and a rotor core 48.
  • the rotor shaft 46 has an axially extending hollow portion 50.
  • the rotor core 48 has a plurality of rotor core holes 52 and a plurality of magnets 54. End plates 56, 58 are disposed at two axial end portions of the rotor core 48.
  • a stator 60 is provided radially outside the rotor 40.
  • the stator 60 includes a stator core 62 which is provided radially outside the rotor 40 and is fixed to the stator housing 20, and a stator coil 64 which is wound around the stator core 62.
  • the stator core 62 is fixed to the stator housing 20 by means of shrink fit.
  • Coil end covers 66, 68 are provided to cover two axial end portions of the stator coil 64, i.e., to cover coil ends.
  • the resolver 70 includes a resolver stator 72 which is attached to the second motor cover 24, and a resolver rotor 74 which is attached to the rotor shaft 46.
  • the resolver rotor 74 is fixed to a rear end portion of the rotor shaft 46 with a bolt 76 which has a generally hat-like section.
  • the stator housing 20 and the first motor cover 22 are connected to each other by a plurality of bolts 78.
  • Each bolt 78 is threaded into a boss 80 which is provided on an output side end portion in an outer circumferential surface of the stator housing 20 and a boss 82 which is provided on an outer circumferential portion of the first motor cover 22.
  • the stator housing 20 and the second motor cover 24 are connected to each other by a plurality of bolts 84.
  • Each bolt 84 is threaded into a boss 86 which is provided on a non-output side end portion in an outer circumferential surface of the stator housing 20 and a boss 88 which is provided on an outer circumferential portion of the second motor cover 24.
  • the bolts 78, 84 are formed short so that they do not take a span from the output side end portion where there is the first motor cover 22 to the non-output side end portion where there is the second motor cover 24, in the outer circumferential surface of the stator housing 20. Therefore, the bolts 78, 84 do not penetrate the stator housing 20 axially. Also, there are no ribs (locally formed thickwalled portions) formed in the outer circumferential surface of the stator housing 20, from the output side end portion where there is the first motor cover 22 to the non-output side end portion where there is the second motor cover 24.
  • a cover 90 is provided on a side of the second motor cover 24.
  • a gasket 92 is placed between the second motor cover 24 and the cover 90.
  • the gasket 92 is formed in a generally annular shape, and has through-holes 94, 96 for communication between oil paths.
  • a pipe 98 extending into the hollow portion 50 of the rotor shaft 46 is attached at a center portion of the cover 90.
  • an oil filter 100 is provided for filtration of oil which is to be supplied into the case 18.
  • the oil filter 100 is supplied with oil from an oil cooler (not illustrated) provided outside the motor unit 10.
  • the oil filter 100 and the first motor cover 22 are connected with each other by a union bolt 102.
  • the speed reducer 14 is provided on a side (left side in the present embodiment) of the first motor cover 22 in order to slow down rotation of the rotor.
  • the speed reducer 14 includes a gear cover 104 provided on a side of the first motor cover 22. Referring to Fig. 3 and Fig. 5 , the gear cover 104 is provided therein with an input gear 106, an intermediate shaft 108, intermediate gears 110, 112, an output shaft 114, and an output gear 116.
  • the intermediate shaft 108 and the output shaft 114 are in parallel to the rotor shaft 46.
  • the input gear 106 is attached to a tip portion of the rotor shaft 46, and is supported rotatably by the first motor cover 22 and the gear cover 104 via input gear bearings 118, 120.
  • the intermediate shaft 108 is supported rotatably by the first motor cover 22 and the gear cover 104 via intermediate gear bearings 122, 124.
  • the intermediate gears 110, 112 are both attached to the intermediate shaft 108.
  • the intermediate gear 110 meshes with the input gear 106.
  • the intermediate gear 112 meshes with the output gear 116.
  • the output shaft 114 is supported rotatably by the first motor cover 22 and the gear cover 104 via unillustrated bearings.
  • the output gear 116 is attached to the output shaft 114.
  • the gear cover 104 covers an outer surface of the first motor cover 22, whereby an oil reservoir 126 which communicates with the return oil path 38 is formed. In other words, the oil reservoir 126 is formed inside the speed reducer 14.
  • the oil reservoir 126 stores oil from the case 18 and oil from the gear cover 104.
  • the gear cover 104 is provided with two oil level gauges 128 for detecting an amount of oil inside the oil reservoir 126. Also, the gear cover 104 is provided with two oil pumps 130 for supplying oil from inside the oil reservoir 126 to the external oil cooler.
  • the inverter 16 is connected with a battery (not illustrated) via connecting terminals 132, converts a direct current from the battery into an alternating current, and supplies the current to the motor 12.
  • the motor unit 10 described thus far is formed with oil paths as follows: Referring to Fig. 5 , the first motor cover 22 has an oil path 134 communicating with the outward oil path 34 to supply oil from the oil filter 100 to the outward oil path 34, and oil paths 136, 138, 140 branching from the oil path 134.
  • the oil path 136 communicates with an oil path 142 inside the speed reducer 14, to supply oil to the input gear bearing 120. Oil from the oil path 138 is supplied to the motor bearing 42 and the input gear bearing 118. Oil from the oil path 140 is supplied to the coil end of the stator coil 64. As described, oil is supplied into the case 18 via the oil paths 138, 140. Oil from the oil path 134 flows through the outward oil path 34 and is supplied to the second motor cover 24.
  • the second motor cover 24 has oil paths 144, 146, 148. Oil which flows through the outward oil path 34 and is supplied to the second motor cover 24 is divided by the branching piece 30, supplied to the coil end of the stator coil 64 via the oil path 144, and sent toward the cover 90 via the oil path 146.
  • the cover 90 has an oil path 150.
  • the oil path 150 is capable of communicating the oil paths 146 and 148 with each other. In other words, the oil path 146 and the oil path 150 communicate with each other via the through-hole 94 of the gasket 92, while the oil path 150 and the oil path 148 communicate with each other via the through-hole 96 of the gasket 92.
  • the oil paths 146 and 148 of the second motor cover 24 communicate with each other via the oil path 150 of the cover 90, and oil from the oil path 146 is supplied to the motor bearing 44 and its surroundings via the oil paths 150, 148.
  • the oil path 150 communicates, via the pipe 98, the hollow portion 50 of the rotor shaft 46 and the rotor core holes 52, with an oil path 152 which leads to the coil end of the stator coil 64. Therefore, oil from the oil path 150 is supplied to the coil end of the stator coil 64 via the oil path 152.
  • the oil from the outward oil path 34 is supplied into the case 18 via the second motor cover 24 and the cover 90.
  • Oil which is supplied to the coil end of the stator coil 64 is then supplied to the oil reservoir 126 via an oil path 154 and the return oil path 38, or via an oil path 156 of the first motor cover 22.
  • the oil path 134 represents the first oil path.
  • the oil paths 138, 140 represent the second oil path.
  • the oil paths 144, 146, 148 represent the third oil path.
  • both of the outward oil path 34 and the return oil path 38 are provided, not between the stator housing 20 and the stator core 62, but outside the stator housing 20, providing communication between the first motor cover 22 and the second motor cover 24.
  • the stator core 62 is fixed to the stator housing 20. Therefore, by simplifying the structure between the stator housing 20 and the stator core 62, it is possible to reduce the size of the stator housing 20.
  • stator core 62 Since the stator core 62 is fixed to the stator housing 20 by means of shrink fit, the outer circumferential surface of the stator core 62 and the inner circumferential surface of the stator housing 20 make surface contact in the circumferential direction, making it possible to hold the stator core 62 more firmly by the stator housing 20.
  • stator housing 20 Since the stator housing 20 has no ribs from the output side end portion to the non-output side end portion in its outer circumferential surface, it is possible to reduce the weight, and further reduce the size, of the stator housing 20.
  • first externally attached pipe 32 which has the outward oil path 34 and is held by the first motor cover 22 and the second motor cover 24
  • the second externally attached pipe 36 which has the return oil path 38 and is held by the first motor cover 22 and the second motor cover 24
  • outward oil path 34 has a smaller sectional area than that of the return oil path 38 makes it possible to discharge oil to outside smoothly without the oil stagnating inside the return oil path 38.
  • the speed reducer 14 Since the speed reducer 14 has the oil reservoir 126 which communicates with the return oil path 38, it is possible to supply oil to the speed reducer 14 smoothly.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Motor Or Generator Cooling System (AREA)
  • Motor Or Generator Frames (AREA)
EP22828007.9A 2021-06-21 2022-03-24 Motor and motor unit Pending EP4362290A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2021102789 2021-06-21
PCT/JP2022/014119 WO2022270088A1 (ja) 2021-06-21 2022-03-24 モータおよびモータユニット

Publications (1)

Publication Number Publication Date
EP4362290A1 true EP4362290A1 (en) 2024-05-01

Family

ID=84544623

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22828007.9A Pending EP4362290A1 (en) 2021-06-21 2022-03-24 Motor and motor unit

Country Status (4)

Country Link
US (1) US20240120797A1 (ja)
EP (1) EP4362290A1 (ja)
JP (1) JPWO2022270088A1 (ja)
WO (1) WO2022270088A1 (ja)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000083351A (ja) * 1998-09-03 2000-03-21 Hitachi Ltd 車両用交流発電機及び車両用冷却装置
JP5328231B2 (ja) * 2008-06-12 2013-10-30 本田技研工業株式会社 車両用駆動モータユニット
JP6108541B2 (ja) * 2013-05-16 2017-04-05 本田技研工業株式会社 電動機
WO2020069744A1 (de) * 2018-10-04 2020-04-09 Gkn Automotive Ltd Elektroantrieb mit kühlung
JP7351167B2 (ja) 2019-09-25 2023-09-27 ニデック株式会社 駆動装置
CN211791056U (zh) * 2020-03-31 2020-10-27 六安华科电机有限公司 一种水冷式电机罩

Also Published As

Publication number Publication date
US20240120797A1 (en) 2024-04-11
JPWO2022270088A1 (ja) 2022-12-29
WO2022270088A1 (ja) 2022-12-29

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